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JavaScript - Exclude some values in average calculation
Let’s say, we have an array of objects like this −
data = [
{"Age":26,"Level":8},
{"Age":37,"Level":9},
{"Age":32,"Level":5},
{"Age":31,"Level":11},
{"Age":null,"Level":15},
{"Age":null,"Level":17},
{"Age":null,"Level":45}
];We are required to write a JavaScript function that calculates the average level for all the objects that have a truthy value for age property
Let’s write the code for this function −
Example
Following is the code −
data = [
{"Age":26,"Level":8},
{"Age":37,"Level":9},
{"Age":32,"Level":5},
{"Age":31,"Level":11},
{"Age":null,"Level":15},
{"Age":null,"Level":17},
{"Age":null,"Level":45}
];
const findAverage = arr => {
const creds = arr.reduce((acc, val) => {
const { Age, Level } = val;
let { count, sum } = acc;
if(Age){
count += 1;
sum += Level;
};
return { count, sum };
}, {
count: 0,
sum: 0
});
return (creds.sum)/(creds.count);
};
console.log(findAverage(data));Output
Following is the output in the console −
8.25
Updated on: 14-Sep-2020
182 Views
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